[Maps] fix Unable to apply styles to vector tiles (#124289)

* [Maps] fix Unable to apply styles to vector tiles

* eslint and tslint

* fix jest test

x-pack/plugins/maps/public/classes/styles/vector/properties/dynamic_size_property.test.tsx

@@ -50,6 +50,9 @@ describe('renderLegendDetailRow', () => {
       supportsFieldMetaFromEs: () => {
         return true;
       },
+      supportsFieldMetaFromLocalData: () => {
+        return true;
+      },
     } as unknown as IField;
     const sizeProp = new DynamicSizeProperty(
       { minSize: 0, maxSize: 10, fieldMetaOptions: { isEnabled: true } },

x-pack/plugins/maps/public/classes/styles/vector/properties/dynamic_style_property.tsx

@@ -295,7 +295,20 @@ export class DynamicStyleProperty<T>
   }
 
   getFieldMetaOptions() {
-    return _.get(this.getOptions(), 'fieldMetaOptions', { isEnabled: true });
+    const fieldMetaOptions = _.get(this.getOptions(), 'fieldMetaOptions', { isEnabled: true });
+
+    // In 8.0, UI changed to not allow setting isEnabled to false when fieldMeta from local not supported
+    // Saved objects created prior to 8.0 may have a configuration where
+    // fieldMetaOptions.isEnabled is false and the field does not support fieldMeta from local.
+    // In these cases, force isEnabled to true
+    // The exact case that spawned this fix is with ES_SEARCH sources and 8.0 where vector tiles switched
+    // from vector tiles generated via Kibana server to vector tiles generated via Elasticsearch.
+    // Kibana vector tiles supported fieldMeta from local while Elasticsearch vector tiles do not support fieldMeta from local.
+    if (this._field && !this._field.supportsFieldMetaFromLocalData()) {
+      fieldMetaOptions.isEnabled = true;
+    }
+
+    return fieldMetaOptions;
   }
 
   getDataMappingFunction() {